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Viefleur [7K]
2 years ago
14

Which expression is equivalent to -1/2 (3- 2/5) ?

Mathematics
1 answer:
Pani-rosa [81]2 years ago
3 0

Answer: The answer is -3 1/2 - 1/5

so it's C.

Step-by-step explanation:

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Solve y'' + 10y' + 25y = 0, y(0) = -2, y'(0) = 11 y(t) = Preview
svetlana [45]

Answer:  The required solution is

y=(-2+t)e^{-5t}.

Step-by-step explanation:   We are given to solve the following differential equation :

y^{\prime\prime}+10y^\prime+25y=0,~~~~~~~y(0)=-2,~~y^\prime(0)=11~~~~~~~~~~~~~~~~~~~~~~~~(i)

Let us consider that

y=e^{mt} be an auxiliary solution of equation (i).

Then, we have

y^prime=me^{mt},~~~~~y^{\prime\prime}=m^2e^{mt}.

Substituting these values in equation (i), we get

m^2e^{mt}+10me^{mt}+25e^{mt}=0\\\\\Rightarrow (m^2+10y+25)e^{mt}=0\\\\\Rightarrow m^2+10m+25=0~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~[\textup{since }e^{mt}\neq0]\\\\\Rightarrow m^2+2\times m\times5+5^2=0\\\\\Rightarrow (m+5)^2=0\\\\\Rightarrow m=-5,-5.

So, the general solution of the given equation is

y(t)=(A+Bt)e^{-5t}.

Differentiating with respect to t, we get

y^\prime(t)=-5e^{-5t}(A+Bt)+Be^{-5t}.

According to the given conditions, we have

y(0)=-2\\\\\Rightarrow A=-2

and

y^\prime(0)=11\\\\\Rightarrow -5(A+B\times0)+B=11\\\\\Rightarrow -5A+B=11\\\\\Rightarrow (-5)\times(-2)+B=11\\\\\Rightarrow 10+B=11\\\\\Rightarrow B=11-10\\\\\Rightarrow B=1.

Thus, the required solution is

y(t)=(-2+1\times t)e^{-5t}\\\\\Rightarrow y(t)=(-2+t)e^{-5t}.

6 0
3 years ago
What is the nearest whole percent of 40
vova2212 [387]
I think it’s 40 i’m not sure tho
8 0
2 years ago
Read 2 more answers
9.675,9.25,9.325,9.5 least to greatest
max2010maxim [7]
9.25, 9.325, 9.5, 9.675
8 0
2 years ago
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Es algo tonto pero no tengo tiempo como se escribe en numero Un millón cuarenta y cinco mil cuatrocientos veinte
zavuch27 [327]

Answer:

<em>Un millón cuarenta y cinco mil cuatrocientos veinte</em> - 1'045.420

Step-by-step explanation:

A continuación, presentamos como se escribe cada componente:

<em>Un millón</em> - 1'000.000

<em>Cuarenta mil</em> - 40.000

<em>Cinco mil</em> - 5.000

<em>Cuatrocientos</em> - 400

<em>Veinte</em> - 20

Ahora, sumamos cada uno de estos números: 1'045.420.

6 0
2 years ago
What number represents the minimum (least)?<br>1.10<br>2.14<br>3.16<br>4.20<br>5.29​
Vinvika [58]

Answer:

10

Step-by-step explanation:

10 is the least of the numbers, it is the lowest

10<14,16,20,29

4 0
3 years ago
Read 2 more answers
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